That's because the zoo has a baby hippo.
The mama hippo was in labor for about two hours before the big, little guy was born in the water at the hippopotamus compound.
Zoo officials don't know if they have a boy or a girl hippo.
The chubby calf is staying close to its mother.
Ma and Pa hippo didn't get along at first.
But zoo keepers say the pair started making hippo whoopee last April.